Heat radiating device for gas furnaces



Jam@ -y CE. W Q3, HASKLL, 5R Lgg HEAT RDTNG DEVICE FOR GASFURNGES Filed Sep. 29, 1930 Patented .lune 14, 1932 PATENT; OFFICE WILLISG. HASKELL, $13 OF CEDAR RAPIDS, IOWA HEAT RADIATING DEVICE FOR GAS FURNACES Application filed September 29, 1930. Serial No. 485,155.

My invention relates to that class of heat radiating devices designed for use in installing gas burners in heat furnaces.

It is the obj ect of my invention to provide a device of this character in which the heat radiating is made up of a 'number of independent sections all exactly alilre and so arranged that they may be fitted into furnaces having combustion chambers of difl ferent interior diameters without having the adjacent edges of the sections overlap, and being so arranged that the draft passageways from the gas burner upwardly and outwardly past the heat radiating devices will be substantially the same in all instances regardless of the diameter of the furnace combustion chamber, and whereby passage of the products ofV combustion through the space between the heatv radiating-devices and the interior of the furnace willbe substantially the same in all installations and may be accurately proportioned with regard to the particular gas burner being employed.

A further object is yto provide improved means for firmly supporting and closely binding together the lower ends of the sectional heat radiating sections, to thereby hold said heat radi-ating sections approximately in contact with eachother throughout their length, so that only aV minimumquantity of the flame from the gas burner will pass between the heat radiating sections.

My invention consists'in the construction, arrangement and combination ofthe variousV parts of the device, WherebytheobjeCts contemplated are attained, fas ,hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompanying drawing, in which:

Figure lshows a vertical, central, sectional view through a furnace having my improve ment installed therein. l.

Figure 2 shows va detail perspective View of one of the heat radiating sections.

Figure 3 shows a horizontal sectional view on the line 3-'3 of Figure 1; and' Figure 4 shows Aa sectional Y View on the line 4.--4of Figure 1.

yReferring to the accompanying drawing have used'thereference `numeral 10 to indicate generally hot air furnace.

Installed in the bottom of the furnace is a series of gas burners 11, preferably arranged in circular form and mounted in a frame 12 containing suitable gas supply pipes 13 for the burners, and these gas supply pipes are controlled by a hand operated valve 14 or -by an automatic controlling device 15. These burners and their controlling devices form no part of my present invention Vand hence are not herein specifically described or illustrated, and they may be of any conventional well known construction.

Supported above the frame 10 and `located centrally between the burners 11 is a support for the heat radiating device. It comprises a circular support 16 having its supporting surface inclined downwardly and outwardly. Loosely mounted upon this supporting surface 1-6 is a circular metal band 17, having its ends extended parallel forming the lugs 18, and the bolt 1-9 is extended through the lugs and provided with a nut 20, so that the band 17 may have its ends dra-wn together to reduce its circumference when desired.

The heat radiating device is formed of a plurality of sections. These sections are made of a material in common use in thevheating art and are commonly called radiants. This material when subjected to a gas 'flame attains a red orwhite heat andvhas a-hi'gh degree of heat radiating properties. Furthermore it is relatively soft as compared with fire clay or brick and may be readily filed away with an ordinary rasp. Each of these sections is relatively long and narrow, widest at its top and segmental in horizontal section, as shown in Figure 4, and the sections lare indicated; by the numeral 2l.

The adjacent edges of `these-sections 21 are beveled, as sho-wn at 22, from their-inner faces at outwardly divergin-g angles Ito arpoint-adjacent to the outer surface of the section where they are provided with relatively thin edges, indicated lvby thevnumeral 23, which edges are radial to the curvature of the sect-ion, ,sothat when two of these lsections are placed side by side-in an arc'of a circle, the

the combustion chamber of a edges 23 will be parallel and the beveled portions 22 will be divergent at the meeting edges of two sections toward the inner surface of the section.

On the outer surface of each of the heat radiating sections I have provided longitudinally arranged grooves and ribs. The grooves are indicated by the numeral 24, and are substantially U-shaped as distinguished from V -shaped, so that they are made as wide as possible at the bottom of the grooves, and the ribs indicated by the numeral 25 are rounded at their outer edges as distinguished from being pointed and present a relatively wide thick outer' end to the action of the products of combustion.

In assembling my improved device on the interior of the combustion chamber, I lirst place a number of sections 21 upon the base 16 with the sections inclined upwardly and outwardly with the outer surfaces of their upper ends resting against the interior of the combustion chamber, as shown in Figure 1.

Obviously when the combustion chamber is of relatively small diameter, these sections will be inclined at one angle, and when the combustion chamber is of relatively large diameter, they will be inclined outwardly and upwardly at a greater degree of inclination.

When all but the last two er three of these sections have been installed, it will be found in some instances that the last one or more of the sections will not accurately lit, except only in the unusual case where the interior of the furnace is of exactly the same diameter as the curvature of the segmental sections. Vhen the last one or more of these sections does not accurately fit, then the operator removes the narrow edge portions 23 of the last section with a rasp or i'ile until it accurately lits with its edges 23 against the adjoining sections.

In Figure 3 I have shown one of these sections smaller than the other', as indicated at A, to illustrate that it has been filed down to fit into the space between the adjacent sections. These sections may be fitted together rather loosely so that the last section may be easily shaped with a lile or rasp to ent-er into its place, and then when all the sections are in position the operator tightens the band 19, thus drawing iirmly together the lower ends of all the sections, While the upper ends remain in contact with the interior of the combustion chamber.

Obviously by having the side edges of my improved sections made relatively narrow at 23, an operator may readily and easily file off said narrow edges to make the sections tit together into any ordinary furnace of the same class.

Further with mv improved device when the heat radiating device is in position with the upper ends of the sections engaging the interior of the combustion chamber, then the total amount of the draft passageway from the burner to the top of the combustion chamber is accurately measured and determined by the total capacity of all of the grooves 24, and this total draft capacity is accurately determined before the manufacture of the heat radiating sections and the 'gas burner. Hence, when installed the products of com bustion will be retarded by the heat radiating and draft controlling devices for the maximum period consistent with the complete and thorough combustion, and this will result in imparting to the heat radiating sections a maximum amount of heat.

In practice I have found that the heat radiating sections attain a red or white heat very quickly after the combustion of the gas b-egins, and retain this heat so long as the burner operates, and hence, these sections radiate heat against the interior of the comb ustion chamber to a maximum degree.

I have also demonstrated that with my improved rib and groove construction for the outer surface of the heat radiating devices I accomplish the following desirable results.

By having the grooves relatively wide at their bottoms as distinguished from V- shaped, a relatively large amount of the products of combustion enter said grooves, and hence the intervening ribs are subjected to this heat and attain a white or red heat very quickly from the bottoms of the grooves to the outer edges of the ribs, and hence the total amount of heat radiating surface is very substantially increased over heat radiating section of this class that have flat outer surfaces, or those having small pointed projections.

Furthermore, when the heat radiating sec tions have flat outer surfaces, or have small pointed projections thereon, a ilm of gas forms, which keeps the radiant sections from absorbing the heat from the burners. With my improved construction these grooves form passageways through which the burning gases escape at a velocity high enough to remove this gas lilm. Hence, the radiant sections absorb the heat more readily.

I claim as my invention:

1. A heating radiating device for furnaces comprising a series of sections, each section being made of a material capable of becoming radiant when subjected to heat, and also of such nature that it may be readily cut away by an ordinary rasp or le, each section having its outer surface segmental in shape to substantially t the interior of a furnace and having the outer portions of its side edges relatively narrow and arranged substantially radial to the curvature of the outer surface with the remainder of the side edges inclined at a relatively acute angle toward each other so that when two sections are arranged side by side only the narrow outer portion-s of their adjacent edges will engage.

2. A heat radiating device for furnaces comprising a series of sections, each section being made of a material capable of becoming radiant when subjected to heat, and also of such nature that it ma be readily cut away by an ordinary rasp or 'le, each section having its outer surface segmental in shape to substantially lit the interior of a furnace and having the outer portions of its side edges relatively narrow and arranged substantially radially to the curvature of the outer surface with the remainder of the side edges inclined at a relatively acute angle toward each other so that when two sections are arranged side by side only the narrow outer portions of their adjacent edges willl engage, the said outer surface of each section being formed with a series of longitudinally arranged grooves with ribs between them, the upper outer ends of the grooves being designed to engage and rest upon the interior of a furnace combustion chamber with the area of the grooves defining a passageway for the products of combustion.

3. A heat radiating device for furnaces comprising a series of sections, each section being made of a material capable of becoming radiant when subjected to heat, and also of such nature that it may be readily cut away by an ordinary rasp or file, each section having its outer surface segmental in shape to substantially fit the interior of a furnace and have the outer portions of its side edges relatively narrow and arranged substantially radially to the curvature of the outer surface with the remainder of the side edges inclined at a relatively acute angle toward each other so that when two sections are arranged side by side only the narrow outer portions of their adjacent edges will engage, a support designed to receive the lower ends of the said sections and comprising a circular body with its surface inclined downwardly and outwardly, a metal band placed on the said support to engage the outei` surface of the sections, and means for adjusting the band to thereby draw together the lower ends of the sections.

wiLLrs G. HASKELL, JR. 

